应用因子分析与系统聚类方法划分现代沉积环境--以九龙江河口区为例

Application of Factor Analysis and System Cluster Analysis to Classification of Modern Sedimentary Environment——A Case Study in Jiulongjiang Estuary

采用因子分析法处理沉积物粒度数据,并依据系统聚类方法将九龙江河口区的现代沉积环境划分为3个亚类:Ⅰ类沉积区沉积物粒度粗,分选差,推移跃移质组分含量高,跃移组分双跳跃,代表往复性高能环境;Ⅲ类沉积区沉积物颗粒细,分选相对较好,推移跃移组分少,悬移组分含量高,代表持续而稳定的低能环境;Ⅱ类沉积区特点介于两者之间,属于过渡性沉积环境.各类亚环境特点符合前人对本区水动力及泥沙运动的研究结果,说明因子分析和系统聚类方法是划分沉积环境的有效手段.

The modern sedimentary environment in Jiulongjiang Estuary can be classified into three types by factor analysis and system cluster analysis. In the first deposition zone, the grain composition of the sediment particles is coarse and bad-sorted. The majority of them are traction load component and saltation load component which have two types. This represents one kind of reciprocation high-energy environment. In the third deposition zone, the grain composition of the sediment particles is fine and well-sorted. There are both low in traction load component and saltation load component while high in the saltation load component. This represents one kind of continual and stable low-energy environment. Compared with above two deposition zone,the second one is a kind of transition environment and its characteristic is situated between above two. The division result conforms to the past research of hydrodynamic force and sediment movement. This indicated factor analysis and system cluster analysis is the effective method of classifying modern sedimentary environment.